Jorge Lorenzo won a crash-plagued MotoGP race at Motorland Aragón in Spain on Sunday, with the help of a prudent decision to switch bikes with just four laps left in the race, when rain started to pour down. The race leader, Marc Márquez, and his Honda teammate, Dani Pedrosa, tried to tough it out and ended up crashing in the wet conditions.

Under MotoGP rules, riders are allowed to switch bikes during wet conditions; Lorenzo’s alternate Yamaha was fitted with rain tires. Even with the late stop, Lorenzo was able to finish 10 seconds ahead of Aleix Espargaró and Cal Crutchlow.

Valentino Rossi and Andrea Iannone were top contenders earlier in the race, but both were among a number of riders who crashed. Rossi, briefly knocked unconscious, was taken to a nearby hospital for further tests for possible head trauma. He later checked himself out of the hospital, against medical advice.

Márquez came in 13th place, which was worth three points and helped extend his season championship lead to 75 over Pedrosa, who came in 14th at Aragón. Márquez now has 292 points with four races remaining on the 2014 calendar.

In other racing news:

■ Jeff Gordon won the 400-mile Nascar Sprint Cup race at Dover, Del., on Sunday, and in the process earned a berth in the next elimination round in the playoff-style battle for the 2014 season championship. Gordon and the second-place finisher, Brad Keselowski, who had advanced in the chase with a victory two weeks earlier in Chicago, were among 12 drivers moving forward in the Chase for the Championship. A. J. Allmendinger, Aric Almirola, Greg Biffle and Kurt Busch were eliminated.

Jimmie Johnson, Joey Logano and Matt Kenseth, who came in third, fourth and fifth at Dover, also advanced to the Contender Round. Other qualifiers were Kevin Harvick, Kyle Busch, Dale Earnhardt Jr., Ryan Newman, Carl Edwards and Denny Hamlin.

Kasey Kahne came back from four laps down at one point in the Dover race to nip Allmendinger for the final qualifying spot.

■ Courtney Force won the Funny Car class at the National Hot Rod Association Midwest Nationals in Madison, Ill., on Sunday, outrunning Matt Hagan in the finals. Force moved closer to the top of the series points standings by beating her father, John Force, the points leader, in the semifinals. It was her fourth victory this season.

Other winners were Antron Brown (Top Fuel), Dave Connolly (Pro Stock) and Jerry Savoie (Pro Stock Motorcycle). Madison was the third stop of six N.H.R.A. “playoff” events that will decide the division winners for the 2014 season.